Insulator



P. C. C. FRIDRICHSENQ INSULATOR.

APPLICATION FILED IuNE Ie, 1919.

PatentedSept. 6, 1921.

@Normes/4 UNITED STATES PATENT OFFICE.

PETER CHRISTIAN CARL FRIDRIGHSEN, 0F WHEELING, WEST VIRGINIA.

Application filed June 16,

To all whom t may concern.'

Beit known that I, Purim CHRISTIAN CARL Fnmniorrsniv, a citizen of Denmark, residing at Wheeling, in the county of Ohio and State of VJ est Virginia, have invented certain new and useful Improvements in an Insulator', of which the following is a specification. l y

This invention relates to improvements in insulators and has for its primary object to provide a device of this character of the two part type in which the wire receiving grooves are arranged in such angular rela tion as to facilitate proper application of a wire or other electrical conductor thereto without accurate adjustment of the insulator, thus economizing in the time and labor necessary to install a wiring system.

Another object is the provision of an im* proved insulator of the base and cap type in which the respective parts are constructed in such manner as to prevent direct contact thereof7 except at the centers of the same, thereby eliminating the possibility of chipping or breaking the fragile material from which the insulators are constructed when the nail or other fastening element is driven home.

With these and other objects in view as will appear as the description proceeds the invention comprises the novel features of construction, combination of elements and arrangements of parts which will be more fully described' in the following specification as set forth with particularity in the claims appended hereto..

Figure 1 represents a side elevation of the cap of the insulator,

Fig. 2 represents a side elevation of the body or base member thereof,

Fig. 3 represents a bottom plan view of the cap member,

Fig. 4 represents a top plan view of the base member, and,

Figs. 5 andl 6 represent vertical sectional views through the cap and base members respectively.

Referring to the drawings in detail, wherein similar reference numerals designate corresponding parts throughout the several views, the numeral 8 indicates the base member of the improved insulator which is preferably constructed of percelain or other material having a relatively low degree of electrical conductivity and is provided with an axial opening 9 adapted to receive a nail,

Specification of Letters `Patent.

iNsULAToR.

vPatented Sept. 6, 1921.

1919. serial No. 304,521.

screw or equivalent fastening element whereby the insulator is secured in position upon a wall or other support. The opening 9 at one terminal of the base is enlarged therebyV defining an annular supporting flange 10 adapted for engagement with the wall orA support and the opposite terminal ofthe base is provided with three wire receiving grooves 1l arranged at substantially degrees to each other and of such width and depth as to partially accommodate a wire or other electrical conductor engaged therewith. The several grooves 11 are arranged equal distances from the outer surface of the cylindrical base 8 and the upper edges 12 thereofare of convex form for a purpose which will hereinafter appear. The terminals of the grooves intersect in the cy lindrical outer face of the base member. A triangular lug or projection 13 is defined be* tween the several grooves 11 and is projected a distance beyond the outer walls 12 of the grooves for reception within the recess 14 formed centrally of the inner or bottom surface of the cap 15 whereby the latter is properly centered upon the terminal of the base 8. An aXial opening 16 is formed centrally i through the cap 15 and, when the parts of the insulator are properly assembled, registers with the axial opening 9 in the base for the reception of the nail or other fastening element as described. The annular rib or flange 17 defined by the central circular recess 14 is provided with a convex bottom surface for engagement with the wire engaged in one of the grooves 11 and said convex face is formed with a Series of radial ribs 18 adapted to coact with a wire confined in one of the grooves 11 whereby said wire is securely held against longitudinal movement or bodily displacement.

In use, it is evident that owing to the angular relation of the several wire receiving grooves 11 at least one of said grooves will be in substantially parallel relation to the wire to be supported, regardless of the position of said wire and in order to further insure against longitudinal movement of the wire, subsequent to its application to the insulator, the bottom of the grooves 11 are preferably formed with upstanding ribs 19 which coact with the radial ribs 18 of the cap to securely clamp the wire in position. When the wire is properly applied and the cap 15 moved to operative position by the nail or other fastener introduced through the apertures 16 and 9 the wire maintains the cap member 16 out of direct contact with the base 8 except that possible partial. contact of relative corners of the triangular projection 13 with the recess 14 in the cap. It is further evident that owing to the convex form of the outer walls of the grooves l1 at the point 12 chipping or cracking of the material of the base is prevented. Breaking or chipping of the edge of the cap 15 being similarly prevented owing to the convex form of the rib or flange 17.

IVhat I claim is:

1. An insulator including cylindrical base and cap members, of uniform diameter throughout, said base member having wire receiving grooves therein, the upstanding portions of the base member lying outwardly of the grooves being of convex form, a projection defined between the grooves, said cap member having a central recess to accommodate said pr0jection,.a portion of said cap member lying outwardly of the recess forming an annular rib, said rib being convex in cross section whereby to present a convex surface to the wire or wires disposed in the grooves and to the convex upstanding portions of the base member, and a series of radiating ribs formed by the annular rib and curved in conformity therewith to preventlongitudinal displacement of the wires disposed in the grooves.

2. In an insulator, cylindrical base and cap members, said base member' having angularly disposed grooves therein arranged in the form of a triangle and adapted to receive wires, said grooves intersecting one another at their opposite ends and providing recesses in the side face of the base member of greater width than the individual grooves to provide outlets for wires, the portion of the base member lying between the angularly disposed grooves being arranged to provide a polygonal lug, the cap member having a correspondingly formed recess for the reception of said lug, whereby to center the latter upon the base member, said lug having contact with the walls of the recess of the cap member at its corners.

In testimony whereof, I aix my signature hereto.

I). CHRISTIAN CARL FRIDRICHSEN. 

